Mullite fibres prepared by sol–gel method using polyvinyl butyral

Zhang, Yabin; Ding, Yaping; Gao, Junfeng; Yang, Jianfeng

doi:10.1016/j.jeurceramsoc.2008.08.008

Cited by 87 publications

(54 citation statements)

References 28 publications

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“…(4) Moreover, the hydroxyl groups and carboxyl groups of tartaric acid can react with the alumina sol and form an organic-inorganic hybrid structure [4]. …”

Section: Resultsmentioning

confidence: 99%

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Preparation of long alumina fibers by sol-gel method using tartaric acid

Tan

2011

Int J Miner Metall Mater

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Long alumina fibers were prepared by sol-gel method. The spinning sol was obtained by mixing aluminum nitrate, tartaric acid, and polyvinylpyrrolidone with a mass ratio of 10:3:1.5. Thermogravimetry-differential scanning calorimetry (TG-DSC), Fourier transform infrared (FT-IR) spectra, X-ray diffraction (XRD), and scanning electron microscopy (SEM) were used to characterize the properties of the gel and ceramic fibers. A little of α-Al 2 O 3 phase is observed in the alumina precursor gel fibers sintered at 1273 K. The fibers with a uniform diameter can be obtained when sintered at 1473 K, and its main phase is also indentified as α-Al 2 O 3 .

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“…(4) Moreover, the hydroxyl groups and carboxyl groups of tartaric acid can react with the alumina sol and form an organic-inorganic hybrid structure [4]. …”

Section: Resultsmentioning

confidence: 99%

“…Main processes for the manufacture of ceramic fibers can be classified as melt-spinning process and sol-gel spinning process [4]. Usually, the melt-spinning method is adopted for the synthesis of ceramic fibers with low melting point.…”

Section: Introductionmentioning

confidence: 99%

Preparation of long alumina fibers by sol-gel method using tartaric acid

Tan

2011

Int J Miner Metall Mater

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“…As far as chemical equilibrium is concerned, the smaller the value of ΔG, the larger the equilibrium constant k is, and the more the products are when equilibrium state is attained. Therefore, the reaction (1) can not process in the lower temperature range (ΔG > 0), the reaction would start extremely vigorous when the temperature was reaching at 1023 K (ΔG < 0). It is found that the free energy change of reactions (2) temperature range of 0-1400 K, mullite whiskers form and grow controlled by reaction (1).…”

Section: Formation Mechanism Of Mullite Whiskersmentioning

confidence: 99%

“…Therefore, the reaction (1) can not process in the lower temperature range (ΔG > 0), the reaction would start extremely vigorous when the temperature was reaching at 1023 K (ΔG < 0). It is found that the free energy change of reactions (2) temperature range of 0-1400 K, mullite whiskers form and grow controlled by reaction (1). This implies that mullite phase may spontaneously form once the temperature of the molten salts reaches the decomposition temperature of aluminum sulfate.…”

Section: Formation Mechanism Of Mullite Whiskersmentioning

confidence: 99%

“…Mullite whiskers have attracted attention as a possible reinforcement for high temperature structure materials. Various processing routes have been reported for the preparation of mullite whiskers such as sol-gel [1,2], high-energy ball milling process [3][4][5], internal crystallization method [6] and thermal decomposition of minerals [7]. However, these conventional synthesis methods have apparent shortcomings that the reactive system needs providing higher crystallization temperature and longer crystallization time.…”

Section: Introductionmentioning

confidence: 99%

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Mullite whiskers prepared by molten salt method using Si powders

Wang

Guo

et al. 2012

J Adv Ceram

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Mullite whiskers were prepared from Si powders in molten Al 2 (SO 4 ) 3 -Na 2 SO 4 mixture salts with different Al/Si molar ratio (R) of raw materials. The resulting mullite whiskers, had been investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectrometer (EDS) and infrared spectroscopy analysis (FT-IR). Mullite phase was obtained in molten salts when the temperature reached at 850 ℃. SEM and EDS results revealed that two kinds of microstructures were formed in the final product, Al-rich mullite pellets and clusters of tiny mullite crystals, and the content of Al-rich mullite pellets increased with the higher Al/Si molar ratio (R) adopted in raw materials. A new oxidation-dissolution mechanism was proposed to explain mullite whiskers growth. According to thermodynamic analysis, mullite phase might be spontaneously formed as the temperature reached the decomposition temperature of aluminum sulfate (1023 K).

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Synthesis and Characterization of Electrospun Mullite Nanofibers

Lin

et al. 2010

Adv Eng Mater

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Mullite (3Al 2 O 3 Á2SiO 2 ) is well-known as superior engineering ceramic materials owing to its relatively high chemical stability, good refractory properties, high temperature mechanical strength, and low thermal expansion coefficient. [1,2] Fabrication of continuous mullite nanofibers is highly desired because it is an important candidate used as reinforcement of metals, ceramics, and resins. [3,4] Several traditional methods such as sol-gel, melt spinning, and solution spinning methods have been used to fabricate mullite fibers. [5][6][7] Electrospinning is a promising technique that utilizes electric forces along to drive the spinning process and to produce fibers. Unlike sol-gel fabricated nanofibers, most of which contain foreign cations as catalysts and require further expensive purification, electrospun nanofibers are more pure, inexpensive, continuous, and relatively easy to align, assemble, and process into applications. [8][9][10][11] Unlike conventional spinning techniques (e.g., melt spinning and solution spinning methods) that are capable of producing fibers with diameters in the micrometer range ($5-15 mm), electrospinning is capable of producing fibers with diameters in the nanometer range ($50-1000 nm) with less cracks. In the recent decade, numerous electrospun ceramic nanofibers including silica, titania, and zirconia, have been fabricated and studied throughout the world. [12][13][14] However, very little literatures have been reported about electrospinning approach fabricating mullite nanofibers due to its more complicated stoichiometry/microstructure and relatively higher synthesis temperature. Recnetly, Dharmaraj et al. have reported the fabrication of electrospun mullite nanofibers, which focused on the sintering process, studying the effect of calcination temperature on the morphology evolution of mullite nanofibers. [15] However, much less attention has been paid to the electrospinning process.In the present work, electrospinning method is introduced to fabricate mullite nanofibers. Three different solvent systems including de-ionized water (DI) (solution A), DI/ absolute alcohol (EtOH) (solution B), and DI/N, N-dimethylformamide (DMF) (solution C) were used to prepare precursor spinning solutions. The effect of different solvents on the micromorphological evolution, crystallization sequence, and structural properties of both the as-electrospun fibers and the final sintered mullite nanofibers will be primarily focused and systematically investigated.

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Mullite fibres prepared by sol–gel method using polyvinyl butyral

Cited by 87 publications

References 28 publications

Preparation of long alumina fibers by sol-gel method using tartaric acid

Preparation of long alumina fibers by sol-gel method using tartaric acid

Mullite whiskers prepared by molten salt method using Si powders

Synthesis and Characterization of Electrospun Mullite Nanofibers

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